Update qubitization.py documentation

[KetpuntoG]

Changing operator order in the documentation

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (b78565c) to head (3431800).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6276      +/-   ##
==========================================
+ Coverage   99.58%   99.69%   +0.11%     
==========================================
  Files         443      443              
  Lines       42273    42022     -251     
==========================================
- Hits        42096    41894     -202     
+ Misses        177      128      -49     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[obliviateandsurrender]

Remember to add a changelog entry.